# US 2018/0324690 A1 · Dcn processing method for plmn, ue, and dcn serving node > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324690 A1 - Document ID: US20180324690A1 - Status: Published application - Kind: A1 - Application number: 16/037,781 - Filed: 2018-07-17 - Published: 2018-11-08 - Earliest claimed: 2016-01-18 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yuan WANG; Fenqin ZHU; Lin SHU - Web page: https://patentgrep.com/patent/US20180324690A1 ## CPC - H04W 48/18: Selecting a network or a communication service - H04W 4/02: Services making use of location information - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W 48/14: using user query {or user detection} - H04W 76/11: Allocation or use of connection identifiers - H04W 88/10: adapted for operation in multiple networks, e.g. multi-mode access points - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present application discloses a DCN processing method for a PLMN that is applied to a network sharing scenario. An access feedback message of a network side is received, and selection assistance information of a DCN and an identifier of a PLMN that serves UE are obtained from the access feedback message, so as to know a PLMN that is actually accessed by the UE. A correspondence between the selection assistance information of the DCN and the identifier of the PLMN that serves the UE is stored. When the UE moves to coverage of the PLMN, a requested DCN to be accessed can be directly determined according to the correspondence, and a RAN node is requested to access the determined DCN. Therefore, a redirection process is reduced, and resource overheads are reduced. ## Claims ### Claim 1 A dedicated core network (DCN) processing method for a public land mobile network (PLMN), applied to a network sharing scenario and comprising: receiving, by user equipment (UE) in a shared network, an access feedback message from a network side, wherein the access feedback message comprises user location information, selection assistance information of a dedicated core network (DCN) that serves the UE, and an identifier of a public land mobile network PLMN that serves the UE, and the identifier of the PLMN that serves the UE is different from an identifier of a PLMN in the user location information; and storing, by the UE, a correspondence between the selection assistance information of the DCN and the identifier of the PLMN that serves the UE, and storing a correspondence between the selection assistance information of the DCN and the identifier of the PLMN in the user location information. ### Claim 2 (depends on 1) The method according to claim 1, wherein the selection assistance information of the DCN is a type of the DCN or a type identifier of the DCN, or information used by an operator to identify the DCN. ### Claim 3 (depends on 1) The method according to claim 1, wherein that the identifier of the PLMN that serves the UE is different from an identifier of a PLMN in the user location information is that the identifier of the PLMN that serves the UE is not comprised in the user location information. ### Claim 4 (depends on 1) The method according to claim 1, wherein the receiving, by UE, an access feedback message from a network side comprises: receiving, by the UE, a non-access stratum (NAS) accept message from a DCN serving node, wherein the NAS accept message comprises the access feedback message. ### Claim 5 A dedicated core network (DCN) processing method for a public land mobile network (PLMN), applied to a network sharing scenario and comprising: receiving, by a dedicated core network DCN serving node that serves user equipment UE, an access request message from the UE; and sending, by the DCN serving node, an access feedback message to the UE, wherein the access feedback message comprises user location information, selection assistance information of a DCN that serves the UE, and an identifier of a public land mobile network PLMN that serves the UE, and the identifier of the PLMN that serves the UE is different from an identifier of a PLMN in the user location information ### Claim 6 (depends on 5) The method according to claim 5, wherein before the sending, by the DCN serving node, an access feedback message to the UE, the method further comprises: determining, by the DCN serving node, that the UE does not support network sharing; or determining, by the DCN serving node, that a shared radio access network RAN node broadcasts only a common PLMN; or determining, by the DCN serving node, that the identifier of the PLMN that serves the UE is not comprised in the user location information; or determining, by the DCN serving node, that the identifier of the PLMN that serves the UE is different from the identifier of the PLMN in the user location information. ### Claim 7 (depends on 5) The method according to claim 5, wherein that the identifier of the PLMN that serves the UE is different from an identifier of a PLMN in the user location information is that the identifier of the PLMN that serves the UE is not comprised in the user location information. ### Claim 8 A dedicated core network (DCN) processing method for a public land mobile network (PLMN), applied to a network sharing scenario and comprising: obtaining, by user equipment (UE), an identifier of an accessed PLMN, and determining, by the UE, that the accessed PLMN has corresponding selection assistance information of a dedicated core network DCN that serves the UE, and including, by the UE, the selection assistance information of the DCN in an access request message sent to a radio access network (RAN) node; or obtaining, by user equipment UE, an identifier of an accessed PLMN, and determining, by the UE, that the accessed PLMN has no corresponding selection assistance information of a DCN that serves the UE, and including, by the UE, a usage type of the UE in an access request message sent to a RAN node. ### Claim 9 (depends on 8) The method according to claim 8, wherein the determining, by the UE, that the accessed PLMN has corresponding selection assistance information of a dedicated core network DCN that serves the UE comprises: obtaining, by the UE, a correspondence between an identifier of a public land mobile network PLMN and selection assistance information of a DCN, and determining, by the UE according to the identifier of the accessed PLMN and the correspondence, that the accessed PLMN has the corresponding selection assistance information of the dedicated core network DCN that serves the UE. ### Claim 10 (depends on 8) The method according to claim 8, wherein the determining, by the UE, that the accessed PLMN has no corresponding selection assistance information of a DCN that serves the UE comprises: when the UE has no correspondence between an identifier of a public land mobile network PLMN and selection assistance information of a DCN, determining, by the UE, that the accessed PLMN has no corresponding selection assistance information of the DCN that serves the UE; or obtaining, by the UE, a correspondence between an identifier of a public land mobile network PLMN and selection assistance information of a DCN, and determining, by the UE according to the identifier of the accessed PLMN and the correspondence, that the accessed PLMN has no corresponding selection assistance information of the dedicated core network DCN that serves the UE. ### Claim 11 (depends on 9) The method according to claim 9, wherein the obtaining, by the UE, a correspondence between an identifier of a public land mobile network PLMN and selection assistance information of a DCN comprises: receiving, by the UE, a correspondence that is between an identifier of a PLMN and selection assistance information of a DCN and that is from a network side; or obtaining, by the UE, a stored correspondence between an identifier of a PLMN and selection assistance information of a DCN. ### Claim 12 User equipment (UE), comprising: a receiver, configured to receive, in a shared network, an access feedback message from a network side, wherein the access feedback message comprises user location information, selection assistance information of a dedicated core network (DCN) that serves the UE, and an identifier of a public land mobile network (PLMN) that serves the UE, and the identifier of the PLMN that serves the UE is different from an identifier of a PLMN in the user location information; and a processor, configured to: store a correspondence between the selection assistance information of the DCN and the identifier of the PLMN that serves the UE, and store a correspondence between the selection assistance information of the DCN and the identifier of the PLMN in the user location information. ### Claim 13 (depends on 12) The UE according to claim 12, wherein the selection assistance information of the DCN is a type of the DCN or a type identifier of the DCN, or information used by an operator to identify the DCN. ### Claim 14 (depends on 12) The UE according to claim 12, wherein that the identifier of the PLMN that serves the UE is different from an identifier of a PLMN in the user location information is that the identifier of the PLMN that serves the UE is not comprised in the user location information. ### Claim 15 (depends on 12) The UE according to claim 12, wherein that the receiver receives the access feedback message from the network side comprises: receiving a non-access stratum NAS accept message from a DCN serving node, wherein the NAS accept message comprises the access feedback message. ### Claim 16 A dedicated core network (DCN) serving node, comprising: a receiver, configured to receive an access request message from user equipment (UE); and a transmitter, configured to send an access feedback message to the UE, wherein the access feedback message comprises user location information, selection assistance information of a DCN that serves the UE, and an identifier of a public land mobile network (PLMN) that serves the UE, and the identifier of the PLMN that serves the UE is different from an identifier of a PLMN in the user location information. ### Claim 17 (depends on 16) The DCN serving node according to claim 16, wherein the DCN serving node further comprises: a processor, configured to: determine that the UE does not support network sharing; or determine that a shared radio access network RAN node broadcasts only a common PLMN; or determine that the identifier of the PLMN that serves the UE is not comprised in the user location information; or determine that the identifier of the PLMN that serves the UE is different from the identifier of the PLMN in the user location information. ### Claim 18 User equipment (UE), comprising: a receiver, configured to obtain an identifier of an accessed PLMN, and a processor, configured to determine that the accessed PLMN has corresponding selection assistance information of a dedicated core network (DCN) that serves the UE, so that the UE includes the selection assistance information of the DCN in an access request message sent to a radio access network (RAN) node; or a receiver, configured to obtain an identifier of an accessed PLMN, and a processor, further configured to determine that the accessed PLMN has no corresponding selection assistance information of a DCN that serves the UE, so that the UE includes a usage type of the UE in the access request message sent to the RAN node. ### Claim 19 (depends on 18) The UE according to claim 18, wherein that the processor determines that the accessed PLMN has the corresponding selection assistance information of the dedicated core network DCN that serves the UE comprises: obtaining a correspondence between an identifier of a public land mobile network PLMN and selection assistance information of a DCN, so that the UE determines, according to the identifier of the accessed PLMN and the correspondence, that the accessed PLMN has the corresponding selection assistance information of the dedicated core network DCN that serves the UE. ### Claim 20 (depends on 18) The UE according to claim 18, wherein that the processor obtains the correspondence between an identifier of a PLMN and selection assistance information of a DCN comprises: receiving, by the UE, a correspondence that is between an identifier of a PLMN and selection assistance information of a DCN and that is from a network side; or obtaining, by the UE, a stored correspondence between an identifier of a PLMN and selection assistance information of a DCN.